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Posted to dev@parquet.apache.org by "David Li (Jira)" <ji...@apache.org> on 2021/03/01 22:24:00 UTC

[jira] [Created] (PARQUET-1993) [C++] Expose when prefetching completes

David Li created PARQUET-1993:
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             Summary: [C++] Expose when prefetching completes
                 Key: PARQUET-1993
                 URL: https://issues.apache.org/jira/browse/PARQUET-1993
             Project: Parquet
          Issue Type: Improvement
          Components: parquet-cpp
            Reporter: David Li
            Assignee: David Li


As a follow up to PARQUET-1820, we should let an application be notified when pre-buffering has completed (e.g. PreBuffer() should return Future<void>). This would let an application pre-buffer some amount of data (across multiple files and/or row groups) and then decode data as it becomes available instead of blocking.

A more ergonomic API would be to expose Future<RecordBatchReader> or something along those lines.



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